Caninae

Dogs and foxes are in a big group.

They first lived in North America. Some were very small. One kind was as light as a small pet.

These animals had long legs. Their long legs helped them move to new lands. They moved to Asia and Africa a long time ago. Some lived in South America too.

Today, many different kinds of these animals live all over the world.

Canines are a group of animals that include dogs, wolves, and foxes.

They first lived in North America about 35 million years ago. One of the first kinds was called Leptocyon.

These animals were very small. One kind weighed only about 2 kg. Leptocyon had teeth for catching small, fast prey.

Canines have long legs and light limbs. These parts helped them travel to new places. They spent most of their history in North America. Then, they moved to Asia, Europe, and Africa.

One early canine to reach Eurasia was the size of a coyote.

Today, canines are split into different groups. One group is the Vulpini, which are foxes. Another group is the Canini. This group includes wolves and other wolf-like animals. There are also canines from South America. These include the bush dog and the maned wolf.

Scientists use DNA to study how these animals are related.

Canines are a special group of living things. They belong to a family called Canidae. Other groups in this family are now extinct. These include the Borophaginae and the Hesperocyoninae.

Today, canines are the only living subfamily left. They are found all over our world. Many people know them as dogs, wolves, or foxes.

How did these animals change over time? It all started with a group called Leptocyon. This name comes from Greek words meaning slender dog.

They were very small animals. One species was only 2 kg. Their teeth were built for snatching small and fast prey. This was different from the Borophaginae. Those animals had skulls made for a powerful killing bite.

We can look back at history to see where they came from. The first canines appeared in North America. This happened during the Oligocene era.

They lived in Sioux County, Nebraska. This was about 34 to 32 million years ago. For a long time, they stayed in North America. They spent two-thirds of their history there. Later, they moved to other lands.

Canines moved to new places in a very interesting way. They had long legs and light limbs. These features likely helped them travel far.

About 7 to 8 million years ago, they spread to Asia. They also moved to Europe and Africa. The first canine to reach Eurasia was Canis cipio. It was about the size of a coyote. Scientists found its fossils in Spain.

Today, we can group canines into different tribes. One tribe is Vulpini, which are the fox-like canines.

Another tribe is Canini. This includes wolves and wolf-like animals. There are also South American canines. These include the maned wolf and the bush dog.

Scientists use DNA to see how they are related. This helps us understand their family tree. It shows how one group branched into many others.

Caninae is a subfamily of animals within the larger family Canidae. While other groups like the Borophaginae and Hesperocyoninae are now extinct, Caninae members are still alive today. These living animals include a wide variety of species, such as wolves, foxes, and jackals. Understanding Caninae helps scientists learn how mammals evolve and spread across the globe.

The history of this group began in North America during the Oligocene epoch. The first primitive canines belonged to the genus Leptocyon. This name comes from the Greek words for "slender dog." These early animals appeared in Sioux County, Nebraska, between 34 and 32 million years ago. They were quite small, with some species weighing only about 2 kg. One specific species, Leptocyon delicatus, was the smallest canid to ever exist.

During the Oligocene, Caninae lived alongside the Borophaginae. These two groups were sister groups, meaning they shared similar features. However, they had very different ways of surviving. The Borophaginae had skulls designed for a powerful killing bite. In contrast, the Leptocyon were built for snatching small, fast-moving prey. This shows how different animals in the same family can adapt to different roles.

Canines have a unique physical build that helped them travel. They possessed longer legs and lighter limbs compared to the Borophaginae and Hesperocyoninae. These physical traits likely aided their ability to disperse to new lands. Canines spent two-thirds of their history in North America. Eventually, they began to move to other continents. About 7 to 8 million years ago, they spread into Asia, Europe, and Africa.

The first canine to reach Eurasia was Canis cipio. This animal was roughly the size of a modern coyote. Scientists have found scant fossils of this species in Spain. It is not entirely clear if C. cipio belongs to the genus Canis or the genus Eucyon. This movement into Eurasia marked a major change in their global distribution.

Modern scientists group Caninae into different tribes based on their traits. One group is the Vulpini, which are the fox-like canines. This tribe includes the genus Vulpes and the genus Urocyon, which contains gray foxes. Another group is the tribe Canini. This tribe includes the wolf-like canines and the South American canines. The South American group, known as Cerdocyonina, includes animals like the maned wolf and the bush dog.

Researchers use molecular data and DNA analysis to map these relationships. These studies show that the wolf-like canines and South American canines form the tribe Canini. Genetic evidence suggests that wolf-like canines, such as Canis, Cuon, and Lycaon, may have an African origin. Meanwhile, molecular data implies that the living Canidae family had a North American origin about 10 million years ago. These complex family trees help us see how one ancestor branched into many different forms.

By studying the phylogeny of these animals, we see a massive variety of life. The fox-like canines are rooted by animals like the fennec fox. The South American clade is rooted by the maned wolf and the bush dog. Even the gray fox and island fox appear as basal groups in some studies. This scientific work connects the ancient fossils of Nebraska to the diverse animals living on every continent today.